nfs_revalidate_mapping
nfs_revalidate_mapping(inode, file->f_mapping);
result = nfs_revalidate_mapping(inode, iocb->ki_filp->f_mapping);
result = nfs_revalidate_mapping(inode, in->f_mapping);
status = nfs_revalidate_mapping(inode, file->f_mapping);
nfs_revalidate_mapping(inode, filp->f_mapping);
err = ERR_PTR(nfs_revalidate_mapping(inode, inode->i_mapping));
extern int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping);